Hawker Aircraft also submitted a proposal, for a swept-wing-and-tail fighter using a Rolls-Royce Tay engine. Work was started to modify the second prototype of the Hawker P.1052 (UK serial numberVX279). The existing Rolls-Royce Nene engine was used for the prototype aircraft. The rear fuselage of the P.1052 was completely replaced with one having a straight-through jet pipe and swept tail surfaces. The first flight of the P.1081 took place on 19 June 1950. CAC, evidently planning to build any design accepted by the Australian government, assigned the serial number CA-24. However, in November 1950, Hawker decided to discontinue its bid for the Australian contract. During 1951, the RAAF ordered (first) the proven Gloster Meteor F.8, as a stop-gap replacement for Mustangs serving the RAAF during the Korean War (which had already been rendered obsolete by encounters with MiG 15s) and, (second), a CAC proposal for a more powerful, Rolls-Royce Avon-engined variant of the North American Sabre (F-86), a project which resulted in the CAC Sabre.[2]